HARTFORD — All that Sejla Kuljancic wanted was her own bedroom in the family's new South End home.

The 12-year-old had been living in a walk-up apartment building with her mother, father and younger brother — a medical hardship once Sejla, diagnosed with pulmonary hypertension last year, labored to climb the stairs.

The Kuljancic family, with the help of city and state homebuyer programs, closed on a Goodrich Street house a few weeks ago and painted the largest bedroom a bubble-gum pink, Sejla's favorite color, while the girl kept tabs on the progress from her hospital room in Boston, family members said. Her health worsened in late August and she needed a double-lung transplant to live.

On Monday evening, more cars than usual were parked on Goodrich. Sejla's parents, stunned with grief, accepted mourners into their living room.

Sejla died Saturday night at Boston Children's Hospital, holding her father's hand, said Alma Nukic, a close relative. Her funeral, arranged quickly through the Bosnian American Islamic Center on Franklin Avenue, was held Sunday and in accordance with the family's faith.

"She's so beautiful," said Nukic, standing in the pink bedroom that Sejla had only seen through cellphone images. Sejla had doted on Nukic's two children. "My son, he's 10 years old. He said, 'Mom, I wish I was Sejla's age; I would give her my lungs.'"

The bedroom closet was filled with Sejla's colorful clothes, including the dresses she picked out during her Make-A-Wish Foundation shopping spree in May. Sejla, then a sixth-grader at Hartford's Naylor-CCSU Leadership Academy, rode in a limousine to Westfarms Mall and brought her oxygen tank, which she needed everywhere.

A donated flatscreen TV from that trip sat on the floor of the pink bedroom Monday, the remote control still wrapped in plastic.

Make-A-Wish volunteer Wilma Hoffman, a retired special education teacher who works part-time at Bulkeley High School, had befriended Sejla and recalled taking her out for ice cream sundaes and pizza. They also chatted on the phone, often about real estate in Hartford — one of Sejla's favorite topics.

"She was so smart," said Hoffman, who assisted the family with the homebuying process and helped Sejla choose the paint color for her room. "She loved this house. She said it was her dream house."

Azemina Kuljancic, 15, of Hartford said her cousin was mature for her age and "full of hope," despite being stricken with pulmonary hypertension. Sejla began feeling ill from the chronic, debilitating disease in June 2013, relatives said.

On Aug. 26, what was supposed to be her first day of seventh grade at Naylor, Sejla was instead transported to Boston Children's, said another cousin, Mirhada Kuljancic, 15.

Sejla's excitement about returning to school was perhaps only trumped by having her own bedroom, Mirhada said. "She talked about the future, if she ever got there."

A bank account has been set up to help Sejla Kuljancic's family. Donations may be made to Sejla's Dream, Attn: Wilma Hoffman, at Webster Bank, 3180 Berlin Turnpike, Newington, CT 06111.